Decimal 255
255 (decimal)
FF (hex) · 11111111 (binary) · 377 (octal)
Number Base Converter
Convert numbers between decimal, hexadecimal, binary and octal instantly.
Was this tool useful?
About this tool
Computers store everything as binary (base 2), but humans usually work with decimal (base 10). Hexadecimal (base 16) is a compact way to represent binary — each hex digit maps to exactly four bits, which is why it appears in memory addresses, colour codes, and cryptographic hashes.
Octal (base 8) was common on older systems and still appears in Unix file permissions — chmod 755 means owner=7, group=5, others=5 in octal.
How to use it
- Type a number in any field.
- All other bases update immediately.
- If the decimal value is a printable ASCII character (32–126), it is shown below the inputs.
Examples
Common problems
- Hex field rejects letters.
- Only digits 0–9 and letters A–F (case insensitive) are valid hex. Letters beyond F are not part of base 16.